1961898984 has 48 divisors (see below), whose sum is σ = 5484885120. Its totient is φ = 632869920.

The previous prime is 1961898949. The next prime is 1961898997. The reversal of 1961898984 is 4898981691.

1961898984 is a `hidden beast` number, since 1 + 9 + 618 + 9 + 8 + 9 + 8 + 4 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 437262 + ... + 441725.

It is an arithmetic number, because the mean of its divisors is an integer number (114268440).

Almost surely, 2^1961898984 is an apocalyptic number.

It is an amenable number.

1961898984 is an abundant number, since it is smaller than the sum of its proper divisors (3522986136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1961898984 is a wasteful number, since it uses less digits than its factorization.

1961898984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879030 (or 879023 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 63.

The square root of 1961898984 is about 44293.3288882197. The cubic root of 1961898984 is about 1251.8689873695.

The spelling of 1961898984 in words is "one billion, nine hundred sixty-one million, eight hundred ninety-eight thousand, nine hundred eighty-four".